Follow-up Comment #4, bug #19281 (project avr-libc):
> Fix in docs or in source?
We don't have locales, so we should restrict the implementation
to just space and TAB. Note the emphasis on "separate words".
This is also justified by the C99 Rationale:
7.4.1.3 The isblank function
A new feature of C99: text processing applications often need to distinguish
white space that can
occur within lines from white space that separates lines (for example, see
ยง6.10 regarding use of
whitespace in the preprocessor). This distinction is also a property of POSIX
locale definition
files.
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